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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Recently issued accounting pronouncements (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
SUMMARY OF PRINCIPAL ACCOUNTING POLICIES |
Cumulative effective adjustment, Increase in accumulated earnings | $ 1.3

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- Definition Amount of the cumulative effect on retained earnings net of related income tax effect. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794 + Details
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